Second, the production steps are as follows: 1. Pour the cooked thick paste into a pot, add sweet potato starch, 2000 grams of clear water and alum water, and knead into a powder ball with moderate hardness for later use; 2. Stir-fry the star anise, ginger slices and pepper granules with oil, pour in the meat foam and the pepper granules, and pour in the sour beans to stir fry; 3. Add a little raw flour, cooking wine, soy sauce, vegetable oil and a little water to the meat foam and stir; 4, add broth to boil, pour in the cooked potato powder, and simmer after boiling. If vinegar, a little chicken powder, add the right amount of salt according to your taste after tasting; 5. Boil gouache in a pot, then pick it into a bowl, and sprinkle with celery, coriander, big head buds, crisp soybeans and beef foam. Learn the way of authentic hot and sour powder, and go to Chengdu to be good.